Analysis of biomass compositions and C, N characteristics of wild jujube in different soil types

In the warm-temperate shrub grassland of Henan Province, wild jujube (Ziziphus jujuba) is one of the most typical vegetation types in the herbaceous plant community. In this study,wild jujube was selected as the research object to discuss the effects of three soil types on the biomass composition and carbon/nitrogen content of the subjects. The results indicated that the total carbon content,total nitrogen content and C/N ratio of brown soil were significantly different from loess soil and cinnamon soil (P<0.05), which was more favourable forbiomass accumulation, especially for the older branches of wild jujube (P<0.05). The leaves of wild jujube had the lowest carbon sequestration ability, but the new branchesshowed the highest ability. In addition, the nitrogen fixation ability of the leaves was the highest when compared with other tissues, which was 2 to 3 times higher than that of new branches,old branches or roots in different depths. The total carbon and total nitrogen content of wild jujube’s leaves in brown soil were significantly higher than those of loess soil and cinnamon soil (P<0.05), but there was no significant difference in the new branches among all soil types (P>0.05). Therefore, in terms of biomass accumulation and carbon and nitrogen fixation, brown soil is beneficial for the growth of wild jujube, and can help wild jujube perform its corresponding ecological functions.